The Piececlopedia: Reflecting Bishop

Historic remarks

Like the Archbishop, which it resembles,
the exact origins of this piece are unknown (if you have more
information, please let us know). The earliest reference I have to it
is Billiards Chess, which was invented by M. Jacques Berthoumeau
in the 1950's, but the piece was most likely not new then.

Movement rules

The Reflecting Bishop moves like a normal chess Bishop, but it has the
additionally power of reflecting off the side of the board at a 90
degree angle. It may not move to the square on which it starts its move.

Movement diagram

In the diagram below, the Reflecting Bishop, which is traditionally symbolized
by an upside-down bishop, can move to all the squares marked with a
black circle.